| 摘要 |
This method for producing a nitrogen oxide adsorbent comprising zeolite loaded with Fe by ion exchange comprises an impregnation step of impregnating zeolite with an aqueous solution of ferric chloride, and a heat treatment step of heating the zeolite impregnated with the aqueous solution of the ferric chloride to a temperature at or above a boiling point of the ferric chloride, thereby loading the zeolite with Fe by ion exchange. By impregnating zeolite with an aqueous solution of ferric chloride and then heating the impregnated zeolite to a predetermined temperature, a large amount of iron can reach ion exchange sites in zeolite, though the reason is not clear. As a result, a resulting Fe-zeolite nitrogen oxide adsorbent improves in ability to adsorb nitrogen oxides.
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